I have my eye on some ASOS-brand shoes, but sadly they only come in whole sizes. I'm a US 7½. If I were to buy them, I would size up and get 8. (I actually used to think I *was* an 8 until I realized that 7½ fit more snugly.) The shoes are exactly the style I've been looking for. Should I risk it, or is it a bad idea to buy shoes online in the first place?